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Finding the Fourth Proportional to 13,836.16, 20,726.80 and 6,430.40

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Solution

The fourth proportional to 13,836.16, 20,726.80 and 6,430.40 is: 9,632.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,836.16 : 20,726.80 = 6,430.40 : x
  2. Step 2: Convert to fraction form
    13,836.16/20,726.80 = 6,430.40/x
  3. Step 3: Cross multiply
    13,836.16x = 20,726.80 × 6,430.40
  4. Step 4: Simplify right side
    13,836.16x = 133,281,614.72
  5. Step 5: Solve for x
    x = 133,281,614.72/13,836.16
  6. Step 6: Final answer
    x = 9,632.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.